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Margaret Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Margaret Mahoney across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Joseph & Joseph — first a daughter (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Typist |
| Industry | General Office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Typist |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1916 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Mary Mahoney | Daughter | — | 41 | ~1899 |
| Anne Mahoney | Daughter | — | 45 | ~1895 |
| Frances Mahoney | Head | — | 76 | ~1864 |
| William Mahoney | Son | — | 43 | ~1897 |
| Margaret Mahoney | Daughter | — | 24 | ~1916 |
Census Appearances
1920
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 13
Cook, Illinois · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 24
Cook-County, Illinois · implied b. ~1916 — 5 household members
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Typist |
| Industry | General Office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Margaret Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Mahoney (~0.92 confidence) and father Joseph Mahoney (~0.92 confidence) and mother Frances Mahoney (~0.92 confidence) and mother Laura Mahoney (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Mahoney
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Joseph Mahoney
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Frances Mahoney
b. ~1864
Source mother
● Household
· direct · ~0.92
Mother
Laura Mahoney
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mahoney
Daughter · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
Anne Mahoney
Sibling · 1940 · age 45
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mahoney
Sibling · 1940 · age 43
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mahoney
Sibling · 1940 · age 41
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00972-00103)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Louis Salomon | 45 | Head | Jobber | France |
| 42 | Jennie Salomon | 34 | Wife | — | Russia |
| 43 | Extra Line Salomon | None | void | — | — |
| 44 | Jacob Besser | 67 | Head | — | Russia |
| 45 | Anne Besser | 64 | Wife | — | Russia |
| 46 | Leon Bobruk | 62 | Head | Bar Tender | Russia |
| 47 | Katie Bobruk | 50 | Wife | — | Russia |
| 48 | Lawrence Bobruk | 11 | Son | — | Illinois |
| 49 | Nicholas Todoroff | 25 | Son-in-law | Core Tester | Illinois |
| 50 | Jean Todoroff | 23 | Daughter | Inspector | Illinois |
| 51 | John Lambros | 56 | Head | Bar Tender | Greece |
| 52 | Angelica Lambros | 40 | Wife | — | Greece |
| 53 | Constantine Lambros | 19 | Son | — | Illinois |
| 54 | Alex Lambros | 18 | Son | New Worker | Illinois |
| 55 | Andrew Spyropoulos | 52 | Lodger | Counterman | Greece |
| 56 | Frances Mahoney | 76 | Head | — | Luxembourg |
| 57 | Anne Mahoney | 45 | Daughter | Clerk | Illinois |
| 58 | William Mahoney | 43 | Son | Laborer | Illinois |
| 59 | Mary Mahoney | 41 | Daughter | — | Illinois |
| 60 | Margaret Mahoney THIS PERSON | 24 | Daughter | Typist | Illinois |
| 61 | Rudolph Dakrinis | 47 | Head | Laborer | Austria |
| 62 | Susan Dakrinis | 47 | Wife | Punch Press Operator | Austria |
| 63 | Elsie Alexander | 38 | Step-daughter | Telephone Operator | Illinois |
| 64 | Nicholas Lagotta | 37 | Head | Machinist | Poland |
| 65 | Marie Lagotta | 35 | Wife | — | Poland |
| 66 | Tim Uskovick | 45 | Lodger | Upholstering | Poland |
| 67 | Edward Puriski | 36 | Head | Engraver | Pennsylvania |
| 68 | Katherine Puriski | 35 | Wife | — | Pennsylvania |
| 69 | Leona Puriski | 14 | Daughter | — | Illinois |
| 70 | Elaine Puriski | 12 | Daughter | — | Illinois |
| 71 | Edward Jr Puriski | 10 | Son | — | Illinois |
| 72 | Henry Loch | 33 | Head | Chauffer | Wisconsin |
| 73 | Emily Loch | 36 | Wife | — | Illinois |
| 74 | Charles Kulik | 52 | Head | Butcher | Russia |
| 75 | Mary Kulik | 47 | Wife | Sales Clerk | Hungary |
| 76 | Angelo De Iuliis | 40 | Head | Laborer | Italy |
| 77 | Jane De Iuliis | 42 | Wife | — | Italy |
| 78 | John Sebastino | 63 | Head | Stock Clerk | Austria |
| 79 | Christina Sebastino | 66 | Wife | — | Austria |
| 80 | Marie Sebastino | 21 | Daughter | Typist | Illinois |
Pedigree Summary
Margaret + 3 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)